Artificial stone.



COATING OR PLASTIC.

UNITED STATES Cross IReferet PATENT ormcn.

JOHANN IBILLWILLER OF GOLDAGH, NEAR ROHRSCHACH, SWITZERLAND.

ARTIFICIAL STONE.

No Drawing.

To allwhom it may concern Be it known that I, Dr.v JOHANN BILL- WILLER, a citizen of Switzerland, and residing at Goldach, near Rohrschach, Switzer- 5 land, have invented certain new and useful Improvements in Artificial Stone, of which the following is a specification.

- It is known to treat caustic magnesia and burnt lime with water-glass, sodium or potassium situate. In both cases quick-setting crumbling substances, heating greatly in setting are obtained, which cannot be easily molded any further. As the inventor has found, a uniformly setting, plastic and coni veniently treated mortar is produced, if

boifate ofliiiie is separated front the latter? Nevertheless small quantities of burnt lime will do no harm. But if more than five per cent. are present a rapid setting :will result and the volumetric permanency is impaired. It has furthermore been ascertained that these disadvantages can be removed by the lime bein h 'drated. V

The invention therefore also relates to a method of rendering too highly urnt dolo- 40 mite containing caustifii'iiie by'aflryslaliijgIproc essjreatable with water-gl'a's'sT 'l he surprising discovery was made, that the thus obtained mortar is by far more plastic. By this previous slaking the hardening property is not reduced.

An addition of able influence on e aruening of the modo eratel burnt dolomite with waterlass or magnesium clilorld. and also a small addi- 5 Specification of Letters Patent.

1 sum will have a favor- Patented Feb. 23, 1915.

Application filed May 18, 1912. Serial No. 698,288.

removing carbon dioxid from the magnesia content of dolomite and treating the resultant product with water glass.

2. A method of making volumetrioally permanent artificial stone compounds, which comprises treating incompletely burnt dolomite in which the carbon dioxidhas been removed from the magnesia, with water-glass, the burnt dolomite being submitted to a preliminary slaking with water to slake its j lime content.

3*A\ method of making volumetrically permanent artificial stone compounds, which comprises treating incompletely burnt dolov mite in which the carbon dioxid has been removed from the magnesia, with water'glass, the burnt dolomite being submitted to a preliminary slaking with water to slake its lime content, whereupon an addition of gypsum is made.

4. A method of making volumetrically permanent artificial stone compounds, which comprises treating incompletely burnt dolo- 8 mite in which the carbon dioxid has been removed from the magnesia, With water-glass, the burnt dolomite being submitted to a preliminary slaking with water to slake its lime content, whereupon an addition of gypsum and a small quantity .of clay is made.

In testimony whereof I hereto aifix my signature in presence of two witnesses.v

DR. JOHANNI BILLWILLER.

Witnesses: Dr. Med. ULLMANN, D. KoNN.

Copies 01' this patent may be obtained for five cents each, by addressing the Commissioner of Eatenta,

Washington, D. O." 

